{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["DNA", "RNA", "cell type", "protein", "cell line"], "input": "REVs do not encode a transactivator targeted to the viral LTR , and cells infected with Marek's disease virus , a herpesvirus with an overlapping host range, do not express factors that preferentially enhance expression from REV or avian sarcoma/leukemia virus LTRs ."}
{"DNA": ["viral LTR", "avian sarcoma/leukemia virus LTRs"], "RNA": [], "cell type": [], "protein": [], "cell line": []}